Yes this is a bit dated, yet even more relevant a topic in today's world of Wordpress, Joomla, OsCommerce, Discussion forums, and all other types of CMS's and CRM based dynamic, database driven websites.
I'm offering it up here for the community to glean some insight from, and also for the feather in my cap, as a shameless plug touting some of the things I'm especially proud of having contributed in the past.
Just because it's dated, doesn't mean it's not wholly relevant.
Besides, it's still a good and entertaining read
http://digg.com/security/Mr_Propelle...Securing_MySQL